Electrocatalytic 2e−oxygen reduction reaction(2e−ORR)is a promising approach to producing H_(2)O_(2) at ambient temperature and pressure especially in acidic media,which,however,is hindered by the high cost of preciou...Electrocatalytic 2e−oxygen reduction reaction(2e−ORR)is a promising approach to producing H_(2)O_(2) at ambient temperature and pressure especially in acidic media,which,however,is hindered by the high cost of precious metal-based electrocatalysts.Hence,the development of efficient earth-abundant electrocatalysts and reaction mechanism exploration for H_(2)O_(2) production by 2e−ORR in acidic solution are critically important but remain challenging at present.In this work,NiSe_(2)has been developed as a novel and high-performance 2e−ORR electrocatalyst in acidic media,moreover,using nickel chalcogenides as the models,the influence of different anion species(Se_(2)^(2−),S22−,and O^(2−))on 2e−ORR electrocatalytic performance of the catalysts has been investigated.The synthesized NiSe_(2)exhibits outstanding 2e−ORR performance of high selectivity(90%)and long-term durability(12 h).The maximum H_(2)O_(2) concentration of NiSe_(2)reaches 988 ppm,which is the highest among all the reported transition metal chalcogenides.This work demonstrates a novel point of view in anion tuning for designing high-efficiency transition-metal-based electrocatalysts for 2e−ORR.展开更多
基金supported by Shanghai Science and Technology Committee Rising-Star Program(No.22QA1403400)the Natural Science Foundation of Shanghai(No.21ZR1418700)the National Natural Science Foundation of China(No.52201271).
文摘Electrocatalytic 2e−oxygen reduction reaction(2e−ORR)is a promising approach to producing H_(2)O_(2) at ambient temperature and pressure especially in acidic media,which,however,is hindered by the high cost of precious metal-based electrocatalysts.Hence,the development of efficient earth-abundant electrocatalysts and reaction mechanism exploration for H_(2)O_(2) production by 2e−ORR in acidic solution are critically important but remain challenging at present.In this work,NiSe_(2)has been developed as a novel and high-performance 2e−ORR electrocatalyst in acidic media,moreover,using nickel chalcogenides as the models,the influence of different anion species(Se_(2)^(2−),S22−,and O^(2−))on 2e−ORR electrocatalytic performance of the catalysts has been investigated.The synthesized NiSe_(2)exhibits outstanding 2e−ORR performance of high selectivity(90%)and long-term durability(12 h).The maximum H_(2)O_(2) concentration of NiSe_(2)reaches 988 ppm,which is the highest among all the reported transition metal chalcogenides.This work demonstrates a novel point of view in anion tuning for designing high-efficiency transition-metal-based electrocatalysts for 2e−ORR.
